Springmvc文件上传下载

@RequestMapping("update")
    public String update(Person per,MultipartFile file,HttpServletRequest request) throws Exception {
     String realPath = request.getSession().getServletContext().getRealPath("upload");
     String fileName = file.getOriginalFilename();//取文件名
     //解决同名问题
     fileName = UUID.randomUUID().toString().replace("-", "")+fileName.substring(fileName.lastIndexOf("."));
     File f1=new File(realPath,fileName);
     if(!f1.exists()){
         f1.mkdirs();//如果不存在则创建其目录
     }
     file.transferTo(f1);//执行上传
     per.setFilepath(fileName);//改变一下路径
        perdb.updatePerson(per);// 实现修改功能
        return "redirect:list.do";
    }

springmvc.xml的配置

下载

   @RequestMapping("download")
    public String download(HttpServletRequest request,HttpServletResponse response,Person per) throws Exception{//下载
        String filepath="//upload//"+per.getFilepath();//从upload下取图片的路径
        FileDownLoad.download(filepath, request, response);
        return null;
    }